Anybody know anything about these guys? Is a TB a TB for the most part?

http://www.professional-products.com/throttleLT1.php

 

From what I have heard everything they make is junk and cheap chinese knock offs.



I will try to find some more info, but I have heard of idle problems, sticking tb, lost of cheap casting





http://web.camaross.com/forums/showt...ight=knockoffs
post #32

 

Nope.

Not exactly. The biggest problems I can think of are as follows:

Linkage, I've heard of some linkage literally failing. You can fasten or weld them better.
Spring, many aftermarket TB's have springs that do not provide adequate force to keep the throttle plates closed when there's airflow going through, or at least not consistently closing to the same spot. Erratic idle and high idle is the result, you'll notice it on the scanner when the PCM reads some small throttle input when it should be zero. Can be fixed by winding the spring tighter or adding a helper spring... but sometimes takes a bit to diagnose the real problem.
IAC bypass, many TB's do not have a bypass drilled. The IAC does not park at the correct position as the IAC needs to open more fully. You can drill your own.
IAC plenum isolation, some TB's don't isolate the IAC circuit from the main plenum. You can fill (epoxy, weld) to isolate or install some tubing. This causes more problems with reversion on the LT1's short intake runners. The more overlap on the cam, the more issue there is.

IMO, I don't think a TB is worth the money or hassle until you really start making power. A ported stocker is the best option but you're limited on size. If you really need a bigger TB than spend the big bucks or put all of the work into a cheaper unit to make it function as intended.

 

Wow... thanks for the info. Good to know... So should I just stick with a BBK TB? And buttercup, the reason I'm going with a bigger TB is because I'm going with a 383 LE2 h/c motor. It needs to breathe

 

I can't remember the pros and cons to each brand and even each brand has changed over the years.

I remember AS&M being the best, although you pay a pretty penny for it!

I have a BBK 58mm TB. I had to drill the IAC bleed hole (easy to do, start small though!). I had to isolate the IAC plenum from the main plenum.

These IAC's issues are not difficult to fix but many people don't know to do them. The car will run without these modifications but it certainly helps!

I also had the problem of a weak spring after running it a while. Took me a while to figure out was going on. I was able to fix the problem by winding the spring tighter, not fun, but it worked.

As long as you are a little bit handy and know of possible issues it'll just be an annoyance at worst.

 

I suppose it's worth mentioning that you should change the transmission shift calibration if you're going with a 58mm TB and have an automatic tranny.

If you're going with that engine combo I'm sure the tuner would take care of the shift tables too though.

 

damm, i ordered one of these yesterday,was in a hurry and it seemed ok, guess i should have turned to the community first, wish i seen this first.

on a side note in a couple weeks when i get my motor together ill be glad to give a write up on this piece first hand

 

Well... I'm building the motor with a friend, who's an awesome mechanic, I'll have to point that out to him, thanks

Again, building it myself and am going to fine tune it myself also. But what would the shift points have to do with the TB?

that would be great